insufficient-data and probe-skype Problems

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insufficient-data and probe-skype Problems

L3 Networker

Hi Guys,

When I'm trying to monitor the traffic via Monitor tab on Palo Alto, i can see insufficient-data under Apllication tab(usin tcp protocol) and probe-skype(using udp protocol).

Who can explain me what means that two applications?I need more info about them.



L7 Applicator

Hello TigranGevorgyan ,

Insufficient data means that there was not enough data to identify the application. So for example, if the 3-way TCP handshake completed and there was one data packet after the handshake, but that one data packet was not enough to match any of our signatures, then you would see insufficient data in the application field of the traffic log.

If you open the traffic logs and analyze it in details, you will see the number of packets in each direction (server to client and client to server) will be very less.

Secondly, the skype-probe is an application for controlling the probing behaviour of Skype. It is working on a UPD protocol with dynamic port.

Reference DOC

Controlling Skype

Incomplete, Insufficient data and Not-applicable in the application field

Hope this helps.


L6 Presenter

Hi Tigran,

Please refer following document for insufficient-data app.

Incomplete, Insufficient data and Not-applicable in the application field

Refer following doc for SKYPE probe.

How to Block SKYPE


Hardik Shah

L7 Applicator

Few more related discussion threads for your reference:


Re: Skype & unknown traffic

Skype-probe rule catching other traffic


Hope this helps.


Good luck controlling skype with the PALO, research using group policy if you are active directory on how to deploy policy to lock things down, this will help you with your attempt to use the PALO app IDS.

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